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We haven’t tested a LiPo and solar panel, but theoretically it should work. The solar panel should be hooked up to the USB pin (5V preferably, I would have to double check for higher voltage), and then it would charge the battery when there was sunlight. If there is no sunlight / solar supply is low, it will run off of the battery instead without having to manually switch the connections. The Qduino’s ‘preferred’ place where it gets power is the USB connector / USB pin, and its ‘backup’ is the LiPo battery, in other words, it will always automatically switch to the higher voltage (it will always run off of the 5V USB connection instead of the 3.7-4.2 volts LiPo battery connection).

You are correct - the pin numbers on the Qduino Mini are the same as the Arduino Leonardo. The available interrupts for use are on pins 0, 1, 2, and 3, because pin number 7 is used for the interrupt on the battery fuel gauge.

The reason that the USB connector and battery connector are on the same side is so that all of the power circuitry can be close together with stronger, shorter connections. We are thinking of changing this possibly in the future, after all of the Kickstarter rewards are fulfilled.

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